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Mirrors > Home > MPE Home > Th. List > toponcom | Structured version Visualization version GIF version |
Description: If πΎ is a topology on the base set of topology π½, then π½ is a topology on the base of πΎ. (Contributed by Mario Carneiro, 22-Aug-2015.) |
Ref | Expression |
---|---|
toponcom | β’ ((π½ β Top β§ πΎ β (TopOnββͺ π½)) β π½ β (TopOnββͺ πΎ)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | toponuni 22815 | . . . 4 β’ (πΎ β (TopOnββͺ π½) β βͺ π½ = βͺ πΎ) | |
2 | 1 | eqcomd 2734 | . . 3 β’ (πΎ β (TopOnββͺ π½) β βͺ πΎ = βͺ π½) |
3 | 2 | anim2i 616 | . 2 β’ ((π½ β Top β§ πΎ β (TopOnββͺ π½)) β (π½ β Top β§ βͺ πΎ = βͺ π½)) |
4 | istopon 22813 | . 2 β’ (π½ β (TopOnββͺ πΎ) β (π½ β Top β§ βͺ πΎ = βͺ π½)) | |
5 | 3, 4 | sylibr 233 | 1 β’ ((π½ β Top β§ πΎ β (TopOnββͺ π½)) β π½ β (TopOnββͺ πΎ)) |
Colors of variables: wff setvar class |
Syntax hints: β wi 4 β§ wa 395 = wceq 1534 β wcel 2099 βͺ cuni 4908 βcfv 6548 Topctop 22794 TopOnctopon 22811 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1790 ax-4 1804 ax-5 1906 ax-6 1964 ax-7 2004 ax-8 2101 ax-9 2109 ax-10 2130 ax-11 2147 ax-12 2167 ax-ext 2699 ax-sep 5299 ax-nul 5306 ax-pow 5365 ax-pr 5429 ax-un 7740 |
This theorem depends on definitions: df-bi 206 df-an 396 df-or 847 df-3an 1087 df-tru 1537 df-fal 1547 df-ex 1775 df-nf 1779 df-sb 2061 df-mo 2530 df-eu 2559 df-clab 2706 df-cleq 2720 df-clel 2806 df-nfc 2881 df-ral 3059 df-rex 3068 df-rab 3430 df-v 3473 df-dif 3950 df-un 3952 df-in 3954 df-ss 3964 df-nul 4324 df-if 4530 df-pw 4605 df-sn 4630 df-pr 4632 df-op 4636 df-uni 4909 df-br 5149 df-opab 5211 df-mpt 5232 df-id 5576 df-xp 5684 df-rel 5685 df-cnv 5686 df-co 5687 df-dm 5688 df-iota 6500 df-fun 6550 df-fv 6556 df-topon 22812 |
This theorem is referenced by: toponcomb 22830 kgencn3 23461 |
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